722778551 has 16 divisors (see below), whose sum is σ = 796003200. Its totient is φ = 650839200.

The previous prime is 722778541. The next prime is 722778559. The reversal of 722778551 is 155877227.

It is a de Polignac number, because none of the positive numbers 2^k-722778551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722778559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651185 + ... + 652293.

It is an arithmetic number, because the mean of its divisors is an integer number (49750200).

Almost surely, 2^722778551 is an apocalyptic number.

722778551 is a deficient number, since it is larger than the sum of its proper divisors (73224649).

722778551 is a wasteful number, since it uses less digits than its factorization.

722778551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630.

The product of its digits is 274400, while the sum is 44.

The square root of 722778551 is about 26884.5411156672. The cubic root of 722778551 is about 897.4324148950.

The spelling of 722778551 in words is "seven hundred twenty-two million, seven hundred seventy-eight thousand, five hundred fifty-one".